Question

Solve the quadratic by taking square roots.  Write your answer with no spaces as x=a,-a where a and -a are the values you found when solving. 
    3x² - 7 = 140
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Answer 1

Answer:

x=7,−7

Step-by-step explanation:

In order to find the value of x in this quadratic equation we first need to make the equation equal 0 by getting rid of the 140. We do this by subtracting 140 on each side.

3x² - 7 = 140

3x² - 147 = 0

Now we solve as a regular quadratic formula

x= $x = \frac{-(0) +- \sqrt{0^{2} - 4(3)(-147) } }{2(3)}$

$x = \frac{0 +- \sqrt{1764} }{6}$

x=7,−7